[W126 Coupe] Switch to R134

[Nathan Goodlet]

I'll add to this my own opinion about what a royal screwing the whole R134 
deal is.

There was NEVER an SEC made with hoses capable of containing R-134. R12 was 
a very large molecule, R134 is a very small one, the hoses that were fine to 
contain R12 cannot conatain R134, Later hoses made for R134 are called 
"barrier" hoses, they were not available before 1994, so whatever result you 
get, good or bad, from converting an old car, unless you replace every inch 
of the rubber hose in the system, you will get screwed again someday when 
there is an "unexplained" loss of coolant, and EPA regulations, the 
regulatory bastards in cahoots with the MACS theiving bastards, they cannot 
legally recharge your system withou finding a leak, which means billing you 
for some part at random. Preferrably the most expensive part.

The Mobile Air Conditioning Society represents the industry standing to make 
billions and billions for years and years forcing US consumers to use 
coolants absolutely forbidden in most of the world as ineffective and toxic. 
They use dirt cheap and incredibly effective propane and isobutane in every 
refigerator in Germany and every car in Asia and I think in Australia and 
I'm sure in New Zealand.

This is a topic done to death years ago, check in the archives. I've posted 
links to research papers many times, the professional standards manual on 
the use of hydrocarbon refrigerants Search for r290
Nathan